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Stoner's return to help out Honda has led to speculation the double world champion could be tempted to make a full-time return in 2014.

But the Australian, who is now competing in the second tier of the Australian V8 Supercars series this year, says that is not part of the plan.

"It's been almost seven months now since Valencia and I'm still happy and comfortable with the decision I made to stop motorcycle racing, even if sometimes I miss riding my RCV," he said.

"That's why I am happy with Honda's offer to do some tests in Motegi this year!"

Honda said a "wildcard" appearance by Stoner in the remaining MotoGP races this season was also "out of the question."

New star

The Japanese team have a new star riding high with Spanish rookie Marc Marquez leading his Repsol Honda team-mate Dani Pedrosa in the championship at the halfway point of the season.

The 20-year-old Spaniard came back from a qualifying crash to win on his first ride round California's Laguna Seca at the U.S. Grand Prix Sunday.

That win -- which included a stunning move on Yamaha's Valentino Rossi -- made him the youngest MotoGP rider to notch up back-to-back victories and the first to win at the California racetrack on debut.

"Before I came here, I was expecting to struggle more," Marquez told MotoGP.com. "From the TV, this circuit looked so tricky.

"At the beginning with a full fuel tank, I was a little bit scared. I'm very, very happy because it's a new circuit and I've got 25 points."

The other podium places at Laguna Seca were settled by Stefan Bradl of LCR Honda, who finished second ahead of seven-time world champion Rossi.